Pay off Conservative no longer lying? (6,2)
I believe the answer is:
square up
'pay off' is the definition.
(as in settling a bill)
'conservative no longer lying?' is the wordplay.
'conservative' becomes 'square' (I've seen this before).
'no longer lying?' becomes 'up' (no longer lying down).
'square'+'up'='SQUARE UP'
(Other definitions for square up that I've seen before include "Pay a debt" , "Settle" , "prepare to fight" .)